Metallicity and Kinematics of the Circumsolar Stellar Population of the Galaxy

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Abstract

The study of the kinematics and genetics of stellar populations in the Galaxy continued within a sphere with a radius of 300 parsecs based on the Gaia catalog (AG300). The main attention is paid to the chemical composition and genetics of stars in the corona of the core (halo) of the Galaxy with highly elliptical orbits and stars with hyperbolic orbits from the vicinity of the Sun. The possible role of various mechanisms of acceleration of the spatial motion of stars in the formation of the stellar corona (halo) of the Galaxy and stars with high hyperbolic (v > 500 km/s) velocities in the vicinity of the Sun is considered. Supernova explosions in close binaries and the disintegration of unstable close triple stars have been proposed as possible mechanisms for the acceleration of these stars. The abundance of iron in corona stars coincides with the abundance of iron in globular clusters, which is an argument in favor of their relationship. It is shown that about 7% of low metallicity stars ([Fe/H] < 3), judging by the position of their apexes, may belong to the “first” stars of the Galaxy, or they are products of the decay of low-mass satellites of the Galaxy.

About the authors

A. V. Tutukov

Institute of Astronomy of the Russian Academy of Sciences

Email: svvs@ya.ru
Russian Federation, Moscow

N. V. Chupina

Institute of Astronomy of the Russian Academy of Sciences

Email: svvs@ya.ru
Russian Federation, Moscow

S. V. Vereshchagin

Institute of Astronomy of the Russian Academy of Sciences

Author for correspondence.
Email: svvs@ya.ru
Russian Federation, Moscow

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